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1.2 Points, Line Segments, Lines and Rays…OH MY!.

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Presentation on theme: "1.2 Points, Line Segments, Lines and Rays…OH MY!."— Presentation transcript:

1 1.2 Points, Line Segments, Lines and Rays…OH MY!

2 Mental Math Solve these subtraction problems. Write your answer on your slate. 9 – 0 = 12 – 6 = 16 – 9 = 17 – 8 = 90 – 40 = 140 – 70 =

3 Math Message Read SRB pages 88 and In your Math Notebook, please list three places where geometry can be found in our world. Be ready to share.

4 Reviewing Points, Line Segments, Lines and Rays A B points When you connect two points using a straightedge, you create a line segment

5 Points, Endpoints and Line Segments A B line segment letters are often used to name a line segment ONE name for this line segment is “line segment AB” A short way to write “line segment AB” is AB Another name for this line segment is “line segment BA” What is the short way to write “line segment BA?” endpoint

6 Stop and Chat! A B How would you describe a line segment to someone who has never seen one before? What are some examples of line segments that we can find in the world? EXAMPLE: part of a spider web endpoint

7 Lines A B lines extending line segment AB in both directions and drawing an arrowhead at each end makes a LINE This line is called “line AB” or “line BA” A short way to write the names of these lines is AB or BA point

8 Stop and Chat! A B point How is a line different from a line segment? What are some examples of lines that we can find in the world? EXAMPLE: The horizon in a landscape

9 Ray C D rays line segment that goes on without end in only ONE direction Point C is the ENDPOINT of the ray CD The letter that names the ENDPOINT is ALWAYS written first. Short way to write the name is CD endpoint point

10 Stop, Try and Chat! C D On your slate, draw ray ZY. Remember that the endpoint of the ray is ALWAYS written first. What are some examples of lines that we can find in the world? Example: Hitting a golf ball endpoint point Short way to write the name is CD

11 Let’s Review! Is it ever possible to draw all of a line? All of a line segment? All of a ray? How many line segments can you name using the points marked on this line? How many rays can you name?

12 Independent work MJ page 4 You can use SRB pages 90 and 91 to help you!

13 Wrap it UP! In your Math Notebook… Draw and label YX Draw and label HG Draw and label VB

14 Addition Top-It

15 Tonight’s Homework

16 Math Boxes


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